linux-kernel - Re: [PATCH 1/1] ptrace: do_notify_parent_cldstop: fix the wrong ->nsproxy usage

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Message-ID: <20090527231248.GB10032@redhat.com>
Date:	Thu, 28 May 2009 01:12:48 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Roland McGrath <roland@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Hellwig <hch@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Pavel Emelyanov <xemul@...nvz.org>,
	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] ptrace: do_notify_parent_cldstop: fix the wrong
	->nsproxy usage

On 05/27, Roland McGrath wrote:
>
> > Actually, ptrace_signal() is fine wrt pid_ns. task_pid_vnr(current->parent)
> > returns 0 if the tracer is not seen from the tracee's namespace, this is
> > correct. So, afaics only ptrace_notify() needs the (low priority) fix.
>
> Oh, both are correct.  Sorry.  These are signals received by tracee, which
> is current, so task_pid_vnr() dtrt.

No, task_pid_vnr(current) in ptrace_notify() is not right. If the tracer
does PTRACE_GETSIGINFO it gets the wrong .si_pid.

Oleg.

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